If these AIs were actually just "remixing" and creating collages, then perhaps I would agree with you... but there is no exact pixel data stored here. This is fairly obvious when you consider that Stable Diffusion was trained on 100 terabytes of images yet the actual model file is 4gb.

Now I'm not saying that nothing created by these AIs should be considered copyright infringement. As a human artist, you are not judged on your process, you are judged on the end results. The same should be done for the works created by these AIs.